I'd put up a different pitch on the "pitches in progress" forum, but this is what I ended up submitting:

Which set are you pitching?

Frontier

What is the name of your pitch?

Land of the Lawless

What are the major mechanical themes in the set according to your vision?

Duels at high noon: duel (Each duelist draws a card, then discards a card. You win if the discarded cards share a card type.)

Gold rush: Prospect—Whenever ~ attacks, reveal cards from the top of your library until you reveal a land card, then put all cards revealed this way on the bottom of your library in any order. DO SOMETHING for each card revealed this way.

Present a booster pack (10 commons, 3 uncommons, and 1 rare or mythic rare) that shows off the set as well as possible. These cards need not be original designs; previous challenges and other people's ideas are fair game.

Commons:

Bank Guard 2W
Creature-Human Soldier (C)
Whenever ~ blocks or becomes blocked by a creature, duel its controller. If you win, ~ gets +0/+3 until end of turn. (Each duelist draws a card, then discards a card. You win if the discarded cards share a card type.)
2/1

Duress B
Sorcery (C)
Target opponent reveals his or her hand. You choose a noncreature, nonland card from it. That player discards that card.
[If you want to catch bandits you can't be afraid to adopt their tactics.]

Juvenile Rattler G
Creature-Snake (C)
Deathtouch
[The young ones are the deadliest. Once one bites it's giving you every drop of venom it's got.]
1/1

Glintveil Adept 2U
Creature-Human Wizard (C)
Prospect—Whenever ~ attacks, reveal cards from the top of your library until you reveal a land card, then put all cards revealed this way on the bottom of your library in any order. Creatures the defending player controls get -1/-0 until end of turn for each card revealed this way.
2/2

Dodge a Bullet W
Instant (C)
Target creature you control gains protection from the color of your choice until end of turn.
[Once you've seen what I've seen, you won't think the prayers are so silly anymore.]

Return to Nature 2G
Instant (C)
Destroy target artifact or enchantment, then duel its controller. You gain life equal to its converted mana cost if you win. (Each duelist draws a card, then discards a card. You win if the discarded cards share a card type.)
[Towns cover the places where our dead lie, but one day they too will crumble.]

Eager Arrival 1R
Creature-Viashino Warrior (C)
Prospect—Whenever ~ attacks, reveal cards from the top of your library until you reveal a land card, then put all cards revealed this way on the bottom of your library in any order. ~ gets +1/+0 for each card revealed this way.
1/1

Play the Odds 2U
Sorcery (C)
Look at the top six cards of target player's library. You may put any number of those cards into that player's graveyard.
[Ain't it funny how one little weight in a die can make the weights of the world go away?]

Trunsh's Seeker 1UU
Creature-Illusion (M)
Prospect—Whenever ~ attacks, reveal cards from the top of your library until you reveal a land card, then put all cards revealed this way on the bottom of your library in any order. For each card revealed this way put a token copy of ~ onto the battlefield, tapped and attacking.
[Nobody could tell Trunsh where to find great treasure, so she checked everywhere.]
2/1